A student uses a computer simulation to learn about electrostatics. In the simulation the student can add electrons or remove electrons from a macroscopic object such as a plastic rod, a pith ball, or a metal sphere.
The simulation then allows the student to determine the net charge in coulombs on the object. The student creates a graph of net charge vs. number of electrons. Note: the graph is not drawn to scale.
What is the slope of this graph?